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A shaft that oscillates on its journals, instead of revolving, -- usually carrying levers by means of which it receives and communicates reciprocating motion, as in the valve gear of some steam engines; -- called also rocker, rocking shaft, and way shaft.

r penetration of many opaque substances, as wood and flesh, their action on photographic plates, and their fluorescent effects. They were called X rays by their discoverer, W. K. Röntgen. They also ionize gases, but cannot be reflected, or polarized, or deflected by a magnetic field. They are regarded as nonperiodic, t…

r the like. Peaceful sleep out the sabbath of the tomb. Pope. Sabbath breaker, one who violates the law of the Sabbath. -- Sabbath breaking, the violation of the law of the Sabbath. -- Sabbath-day's journey, a distance of about a mile, which, under Rabbinical law, the Jews were allowed to travel on the Sabbath.…

That which relates to a sacrament. Bp. Morton.

Thin boards for shealting, as above the rafters, and under the shingles or slates, and for similar purposes.

toothlike structures inserted along each edge, forming a sawlike organ with which it mutilates or kills its prey.

A kind of chopping instrument for trimming the edges of roofing slates.

The scaphoid bone. Scaphoid bone (a) One of the carpal bones, which articulates with the radius; the radiale. (b) One of the tarsal bones; the navicular bone. See under Navicular.

One of the plates from which the arms of a crinoid arise.

a foliated structure (see Foliation) and hence admitting of ready division into slabs or slates. The common kinds are mica schist, and hornblendic schist, consisting chiefly of quartz with mica or hornblende and often feldspar.

Especially, such knowledge when it relates to the physical world and its phenomena, the nature, constitution, and forces of matter, the qualities and function of living tissues, etc.; -- called also natural science, and physical science. Voltaire hardly left a single corner of the field entirely unexplored in science,…

To emit sparks, or fine igneous particles. As the electrical globe only scintillates when rubbed against its cushion. Sir W. Scott.

The slips or plates of metal out of which circular balnks have been cut for the purpose of coinage.

Having the integument, or skin, hard, or covered with hard plates.

Protected or covered by bony or horny plates, or large scales.

, a floor, or other structure; the line of union, or joint, of two boards, planks, metal plates, etc. Precepts should be so finely wrought together . . . that no coarse seam may discover where they join. Addison.

of the net are attached. Seaming machine, a machine for uniting the edges of sheet-metal plates by bending them and pinching them together.

An instrument or apparatus for comparing and grading the sensitiveness of plates, films, etc., as a screen divided into squares of different shades or colors, from which a picture is made on the plate to be tested.

One of the radial calcareous plates of a coral.

The act or operation of dividing with shears; as, the shearing of metal plates.